Now we need protection from rods of negation and spheres of annihilation. The latter could be handled with the talisman of the sphere (more or less), but the rod...? Not so sure about that one.
Either way, make sure you have a backup weapon, just in case.
Could you have your sword be intelligent and give it Disintegrate as a spell it can cast? Ready counterspelling against mages.
[edit] Also, be dvati, become undead, then have one body Haunt Shift it. Good times.